I am 20 years old going on 21.

I am on birth control (pill) I never miss a day.

I noticed though that about 3-5 before my period is due I started spotting, its a very faint brown light pink color that wasnt heavy at all. I didnt even notice it until I would wipe while using the restroom. My last period was oct 14-19. I had unprotected sex between oct 31st until nov 3 with my boyfriend. I took a pregnany test on monday (negative) when I first started spotting which would put me 5 days before my period. Should I take another test or wait until I start my period? This sort of thing is very new to me & I've never really had a scare before.

I'm worried this could be implantion bleeding